Let's divide 21705168 by 809
We're looking to find how many times 809 goes into 21705168.

Moving on to step 1:
When dividing 2 by 809, we get 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 809

Going ahead to step 2:
When dividing 21 by 809, we get 0 with a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Include the next digit (7) from the dividend after 21, then repeat: 217 / 809

Let's proceed to step 3:
809 goes into 217 0 times with a remainder of 217.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 217, we get 217.
Append the next digit (0) from the dividend to 217 and continue with: 2170 / 809

On to step 4:
809 goes into 2170 2 times with a remainder of 552.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we take 1618 away from 2170, we end up with 552.
Fetch the next digit (5) from the dividend, attach it to 552 and continue: 5525 / 809

Advancing to step 5:
The number 809 fits into 5525 6 times, leaving a remainder of 671.
The next digit of our result is 6. 
Result so far: 26.0
If we subtract 4854 from 5525, we get 671.
Fetch the next digit (1) from the dividend, attach it to 671 and continue: 6711 / 809

Advancing to step 6:
6711 divided by 809 is 8 with a remainder of 239.
Use 8 as the next digit of our solution. 
Result so far: 268.0
Subtract 6472 from 6711 to get 239.
Grab the next digit (6) from the dividend, add it to 239, then carry on: 2396 / 809

Going ahead to step 7:
2396 divided by 809 is 2 with a remainder of 778.
The number 2 becomes the next digit in our result. 
Result so far: 2682.0
If we take 1618 away from 2396, we end up with 778.
Append the next digit (8) from the dividend to 778 and continue with: 7788 / 809

Step 8:
809 can be fit into 7788 9 times, resulting in a remainder of 507.
Record the quotient 9 as the next digit in the result. 
Result so far: 26829.0
Deduct 7281 from 7788 and we're left with 507.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5070, and continue the process.

Advancing to step 9:
5070 divided by 809 is 6 with a remainder of 216.
Put 6 as the next digit of the answer. 
Result so far: 26829.6
The remainder is 216 after subtracting 4854 from 5070.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

On to step 10:
809 can be fit into 2160 2 times, resulting in a remainder of 542.
Use 2 as the next digit of our solution. 
Result so far: 26829.62
Subtracting 1618 from 2160 leaves us with 542.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5420, and continue the process.

Let's proceed to step 11:
809 can be fit into 5420 6 times, resulting in a remainder of 566.
Record the quotient 6 as the next digit in the result. 
Result so far: 26829.626
If we take 4854 away from 5420, we end up with 566.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5660, and continue the process.

On to step 12:
The number 809 fits into 5660 6 times, leaving a remainder of 806.
Use 6 as the next digit of our solution. 
Result so far: 26829.6266
Subtract 4854 from 5660 to get 806.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8060, and continue the process.

The final result is 26829.6266 with a remainder of 0.00806.